反应详情

Piperidine-1,3-dicarboxylic acid 1-benzyl ester 3-ethyl ester (7) (1.5 g, 5.83 mmol) was dissolved in 5.8 mL of anhydrous THF, and the reaction was stirred under N2 at −5° C. while lithium aluminum hydride dissolved in THF (7.0 mL, 1.0M) was added dropwise by addition funnel over 30 minutes. When the reaction was complete by TLC (10 min.), H2O (0.6 mL), then 10% NaOH (1.5 mL), then H2O (0.6 mL) were added, and the reaction was stirred for about 45 minutes. The salts were removed by filtration and the solution was dried with sodium sulfate, filtered, and concentrated. The crude material was purified using an ISCO CombiFlash flash column (silica, 80:20 Hexane:EtOAc to 40:60 Hexane:EtOAc) to achieve 1.24 g of pure 8 (66% yield).

1. additionwas added dropwise by addition funnel over 30 minutes
2. customThe salts were removed by filtration
3. dry with materialthe solution was dried with sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated
6. customThe crude material was purified